Rockwell Automation 22A PowerFlex 4 User Manual FRN 6.xx - Manual (Page 93)

Appendix
C
RS485 (DSI) Protocol
PowerFlex 4 drives support the RS485 (DSI) protocol to allow efficient
operation with Rockwell Automation peripherals. In addition, some
Modbus functions are supported to allow simple networking. PowerFlex
4 drives can be multi-dropped on an RS485 network using Modbus
protocol in RTU mode.
For information regarding DeviceNet or other communication protocols,
refer to the appropriate usr manual.
Network Wiring
Network wiring consists of a shielded 2-conductor cable that is
daisy-chained from node to node.
Figure C.1 Network Wiring Diagram
Only pins 4 and 5 on the RJ45 plug should be wired. The other pins on
the PowerFlex 4 RJ45 socket contain power, etc. for other Rockwell
Automation peripheral devices and must not be connected.
Wiring terminations on the master controller will vary depending on the
master controller used and “TxRxD+” and “TxRxD-” are shown for
illustration purposes only. Refer to the master controller’s user manual
for network terminations. Note that there is no standard for the “+” and
“-” wires, and consequently Modbus device manufacturers interpret
them differently. If you have problems with initially establishing
communications, try swapping the two network wires at the master
controller.
Controller
Master
PowerFlex 4
Node 1
4
5
PowerFlex 4
Node 2
4
5
PowerFlex 4
Node "n"
4
5
TxRxD+
TxRxD-
TxRxD+
TxRxD-
TxRxD+
TxRxD-
NOTE: The shield is connected at ONLY ONE end of each cable segment.
Shield Shield Shield
120 ohm resistor
120 ohm resistor
X X X
FRONT
PIN 8
PIN 1